Telephone-transmitter



(No Model.)

J. F. McLAUGHLIN.

TELEPHONE TRANSMITTER.

No. 341,263. Patented May 4, 1886.

. INVE R/ ATTO Y UNITED STATES PATENT OFFICE.

JAMES F. MCLAUGHLIN, OE PHILADELPHIA, PENNSYLVANIA.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 341,263, dated May 4, 1886.

Application filed March 23, 1885. Serial No. 159,760. (No model.)

To aZl whom it may concern: I

Be it known that I, J AMES F. McLAUGH- LIN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Telephonic Transmitters, of which the following is a specification, reference being had therein to the accompanying drawing, which is a vertical longitudinal section of telephonic transmitter embodying my improvements.

My invention has relation to that form of telephonic transmitters wherein the pulsations or variations in the electric current are produced by varying the resistance or electric conductivity of carbon or like electrodes; and it has for its object the simplicity of construction and the arrangement of parts for obtaining an effective form of instrument, wherein the usual pressureregulating devices for the electrodes are dispensed with and the elec trodes themselves or their connections made to inherently or automatically adjust or regulate the pressure upon or between the elec trodes as the diaphragm vibrates inwardly and outwardly.

My invention accordingly consists of a telephonic transmitter having a carbon block or electrode made in the form of a cog, ratchet, or other toothed wheel or roller arranged or disposed so that an inherent or self-adjusting gravity pressure is obtained between it and the remaining electrode, as hereinafter more particularly described and claimed.

In the drawing, A represents any suitable form of boX or case having a door or hinged side, a, to which is suitably secured the diaphragm 13. Upon the inner face of the latter and at its center is fastened a metal stud or bar, 0, to the outer end of which is pivoted a metal link, D. In the end (I of link D is mounted a cog, ratchet, or other toothed wheel, E, made of carbon or like material, to form an electrode, which, being pivotally supported, impinges by gravity upon a disk of carbon or electrode, E, rigidly afiixed, preferably in an inclined position, as shown, to the upper end of a metal bracket, E, suitably secured to hinged door or side (I. All of said metal bars, links, and brackets are preferably made of brass, but any other suitable material may be used.

As the diaphragm moves inwardly and outwardly under the influence or" impacting sound waves, the toothed electrode E rides or moves up and down upon the fixed electrode E, or follows the vibrations of the diaphragm to antomatically or inherently increase the pressure between or upon said electrodes as the diaphragm moves inwardly and decrease such pressure as the diaphragm moves outwardly. During the to-and-fro movement of electrode E it tends to and rotates upon the electrode E, to distribute the wear evenly upon all the teeth of the electrode F.

The transmitter is placed in the line or battery circuit in the usual or other desired way.

\Vhat I claim is- In a telephonic transmitter, the combination of diaphragm B, havingpivoted link D, provided at its outer or free end with a toothed electrode, E, a fixed inclined electrode, E, and circuit-connections with an electric battery or generator, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES F. MoLAU-GHLIN.

Vitnesses:

JOHN Roncnns, S. J. VAN STAVOREN. 

